Electric switch



Apri 12,- w32. L. 11. @www 9853087 ELECTRC SWTCH Filed Jara, 6, 1950 2Sheds-Sheet l -April 12, 1932. L, i. gHlppY 1,853,087

. ELECTRIC SWITCH Filed Jan. 6, 1950 2 Sheets-Sheet 2 Y I? i* Y yPatented Apr. 12, 1932 PATENT FFEQE LEO C. SHIPPY, F ANDERSON, INDIANA,ASSIGNOR IO DELCO-REMY CORPORATION, OF ANDERSON, INDIANA, A CORPORATIONOF DELAWARE ELECTRIC SWITCH Application led January 6, 1930. Serial No.418,849.

This invention relates to automatic controls for valves and the like,particularly for controlling pressure applied to hydraulic presses, forexample, presses for molding articles from material which is of phenoliccondensation product. One example of such control is shown in mycopending application, Serial Number 352,310 filed April 3,

1929. This application discloses a rotary l0 valve having four positionsinto which the valve may be moved by quarter turn revolutions of theoperation shaft of the valve. The

valve shaft is operated by an electric motor which is caused to operateintermittently at 15 predetermined times to produce the one-quarter turnrevolutions of the valve shaft by an electrically operated controlmechanism operated by a small constant speed motor running atsubstantially constant speed and including certain circuit breakersoperated by cams driven by the small motor which control circuits alsocontrolled by a two-way switch operated by a shaft which moves with theshaft which turns the valve.

One of the objects of the present invention is to provide suchimprovements in a twoway switch adapted for the control system referredto so as to enable it to be produced at low cost.

AA further object of the invention is to provide for certain adjustmentsof the two-way switch by which the relation between the switch operatingmechanism and the ovcle of operations of the switch may be varied.

Further objects and advantages of the present invention will be apparentfrom the following description,reference being had to the accompanyingdrawings wherein a. preferred embodiment of one form of the presentinvention is clearly shown.

In the drawings:

Fig. 1 is a sideview of a switch embodying the present invention showingthe switch 5 housing members in longitudinal cross section.

Fig. 2is a side elevation of a stationary part of the switch looking inthe direction of the arrow 2 in Fig. 1.

Fig. 3 is a side elevation of the removable part of the switch lookingin the direction of the arrow 3 in Fig. 1.

Fig. 4 is a sectional view on the line 4 4 of Fig. 3.

Fig. 5 is an edge view of the movable switch contact member shown inFig. 3.

Fig. 6 is a fragmentary sectional view on the line 6 6 of Fig. 1.

Fig. 7 is a wiring diagram illustrating the use of the presentinvention.

A stationary bracket 10 is integral with a cupshaped switch housing 11providing a bearing for a hub 12 integral with a flange 13 which isattached by rivets 14 with a nonconducting disc 15 to which rivets 16secure a metal disc 17 which has been partly sheared away along thelines a, t, o and d, e, f to provide resilient spring fingers 18 and 19respectively which are bent away from the plane of the main portion ofthe disc 17. The hub 12 is fastened by screw 12a to an operating shaft20.

The flange 11a of the housing 11 is attached by screws 21 to a clampingring 22 which provides a journal bearing for a rotatable housing 23which may be angularly adjusted relative-to the axis of the shaft 2O andwhich may be clamped against the housing 11 in the desired position ofadjustment by tightening the screws 21. The screws 24 secure anonconducting plate 25 to the housing 23. Plate 25 carries a pair ofdiametrically opposite arcuate contacts 70 located in a circular rowtogether with a pair of diametrically opposite contacts 71. Thesecontacts are attached in any suitable manner as by rivets 26. The pairof contacts 7 0 is connected by a jumper 70a and one of these contactsis connected with a wire 68. The other pair of contacts 71 areyconnected by a jumper 71a and one of these contacts is connected with awire 69. The wires 68 and 69 and also the common lead wire 51 enter thehousing 23 through suitable holes in the side wall thereof. The commonwire 51 is connected with a central terminal 27 secured to the plate 25and providing a recess 28 for receiving a spring 28a which urges acontact 29 against the central portion of the movable Contact disc 17.Each of the contacts 70 is provided with an outl wardly bent end portion72, and each of the contacts 71 is provided with similarly outwardlybent end portion 73, each outwardly bent portion being located adjacentthe unbent end of an adjacent contact. Assuming that the spring fingers18 and 19 are engaging contacts 70 as shown in Fig. 7, the turning ofthe shaft 20 clockwise as viewed in Fig. 7 or Fig. 2 (counter-clockwiseas viewed in Fig. 3) the lingers 18 and 19 will ride upon the outwardlybent portion 72 of the contact 70 and then will abruptly move away fromthe contact portion 72 into engagement with the adjacent contacts 71 inorder to quickly interrupt the circuit formerly made through theengagement of the fingers 18 and 19 with the contact 70. Similarly, thespring fingers 18 and 19 must ride up along the outwardly bent portion73 of contact 71 before moving out of engagement with the contact 71 andinto engagement with the contact 70. In this way a quick breaking of thecircuit is effected, thereby tending to reduce arcing and prolong thelife of the switch contacts.

The manner of using the two-way switch embodying the present inventionwill be ei;- plained with reference to Fig. 7. In this figure numeraldesignates a rotary valve operating within a housing 31 and operated bya shaft 32 connected by a sprocket gear 33, chain 34 and sprocket gear35 with the shaft 20. Shaft 20 carries a square gear 36 meshing with agear 37 driven by a coaxial gear 38 meshing with a gear 39 driven by acoaxial worm gear 40 driven by a worm 41 on a shaft 42 driven by anelectric motor 43. The main motor switch is designated by numeral 45 andis eleetromagnetieally operated into circuit closing position by anelectro-magnet comprising an armature 47 and a relay winding 48. Aspring 46 tends to maintain the switch 45 in open position. Numeral 50designates a power line connected by a wire 49 with the relay magnet 48having its other end connected with the center contact 29 of my improvedtwo way switch.

The power line 50 is connected with one of the terminals of a smallconstant speedl motor 100 and its other terminal is connected by wire101 with wires 132, 133, 134 and 135 which are connected respectivelywith stationary contacts 102, 141, 143 and 145. The other power line 108is connected by a flexible leaf spring conductor 106 with a circuitbreaker 104 pivoted at 105 and carrying a movable contact 103cooperating with the contact 102. Lever 104 carries a rubbingfblock 107urged by the spring 106 against a cam 110 provided with a notch 122which, when located adjacent the rubbing block 107 permits movement ofthe lever 104 toward the cam 110 suliiciently to allow the contact 103to separate from the contact 102. The. cam 110 is mounted on a shaft 116carrying a gear 119 meshing with a gear 118 driven by a gear 114operated by the shaft 112 of the motor 100. The shaft 116 carries alsocams 124, 127 and 130.

Cam 124 is provided with notches 125 and 126. The wire 68 is connectedwith contacts of the two-way switch leads to a leaf spring conductor 149attached to a circuit breaker lever 146 pivoted at 147 and carrying arubbing block 148 which is urged by the spring 149 against the cam 124.Lever 126 carries a contact 140 cooperating with the contact 141.

The wire 69 to which the contacts 71 of the two-way switch are connectedis connected by wire 160 with a leaf spring conductor 153 connected witha circuit breaker lever 150 carrying a contact 142 cooperating with thecontact 143. The lever 150 is pivoted at 151 and is urged toward the cam127 by the leaf spring 153. The cam 127 is provided with a notch 128 forreceiving the circuit breaker rubbing block 152 when permitting thecontact'142 to engage the contact 143.

The wire 69 is connected also with a wire 161 leading to a leaf springconductor 158 connected with a circuit breaker 155 carrying a contact144 which cooperates with the contact 145. The lever 155 is pivoted at156 and carries a rubbing block 157 urged by the spring 158 against thecam 130 which is provided with a notch 131 for receiving the rubbingblock 157 when it is desired to permit the contact 144 to engage theContact 145.

Fig. 7 shows the apparatus in normal position. It will be noted that theswitches controlling the motors 100 and 43 are open. In order toinitiate cycle of movement of rotary valve 30, the motor 100 must bestarted. This is accomplished by manually turning the cam 110 in aclockwise direction as viewed in Fig. 7, so that the notch 122 can bemoved away from the cam follower 107 in order t0 close the switchcontacts 102 and 103. Then the motor 100 will drive the shaft 116through the train of gearing so that the shaft 116 will turn clockwisevery slowly, the sha-ft completing one revolution for every cycle ofmovements of the valve 30. After a slight rotation of the shaft 116 hastaken place, the notch 126 will be moved into radial alignment with thecam follower 148 in order to permit the spring 149 to close the switchcontacts 140 and 141. When this occurs, the magnet 48 will be energizedthrough the circuit: wire 49, magnet coil 48, wire 51, contacts 29, 17

and 70, wire 68, spring 149, lever 146, contacts 140 and 141, wires 133and 132, contacts 103 and 102, lever 104, spring 106 and wire 108. Thenthe main switch 45 will be closed and the valve actuating motor 43 willturn shaft 32 90o in a clockwise direction, as viewed in Fig. 7. Duringthis movement, the switch arms 18 and 19 will be moved by shaft 20 awayfrom contacts 70 and will contact with contacts 71 and the motor 43 willstop since the circuit of magnet coil 48 is interrupted.

The motor 100 will continue to rotate until the notch 131 of the cam 130has been moved into radial alignment with the cam follower 157 in orderto permit the closing of the switch contacts 144 and 145. Vhen thisoccurs, the magnet 48 will be energized into the following circuits:wires 50 and 49, coil 48, wire 51, contacts 29, 17 and 71, wires 69 and161, spring 158, lever 155, contacts 144 and 145, wires 135 and 132,contacts 103 and 102, lever 104, spring 106 and Wire 108. Then theswitch 45 will be closed and the motor 43 will rotate the shafts. 20 and32 through the second quadrant so as to rotate the valve 30 through asecond 90. During this movement the shaft 20 is turned so as todisconnect the Contact arms 18 and 19 of contact 17 from contacts 71 andto connect said arms 18 and 19 with contacts 70. The motor 43 will againstop, since the circuit of the magnet coil 48 is interrupted. lVhen thisoccurs, the magnet 48 is de-energized causing the spring 46 to openswitch 45.

The motor 100 continues to rotate until the notch 125 of the disc 124 ismoved into radial alignment with the cam follower 148 in order to permitthe closing of the switch contacts 140 and 141. When this occurs, themagnet coil 48 will be energized by the following circuits: wires 50 and49, coil 48, wire 51, contacts 29, 17 and 70, wire 68, spring 149, lever146, contacts 140 and 141, wires 133 and 132' (contacts 102 and 103,lever 104, spring 106 and wire 108. lVhen this occurs, magnet coil 48will be energized again, the switch 45 will be closed, and the motor 43will rotate the shafts 20 and 32 through the third quarter turn therebyto move valve 30 into its third position and to move the contact arms 18and 19 0f contact 17 from the contacts to the contacts 71. The motor 43will stop since the circuit of magnet 48 is again interrupted.

The motor 100 will continue to rotate until the notch 128 of the disc127 has been moved sufliciently to permit the cam follower 152 to moveinto notch 128 to permit closing of the contacts 142 and 143. Then thisoccurs, the magnet coil 48 will be energized by the following circuits:wires 50 and 49, magnet coil 48, wire 51, contacts 29, 17 and 71, wires69 and 160, spring 153, lever 150, contacts 142, and 143, wires 134 and132, contacts 102 and 103, lever 104, spring 106 and wire 108. When thisoccurs, magnet coil 48 will be energized again, the switch 45 will beclosed, and the motor 43 will rotate the shafts 20 and 32 and the valve.30 through the fourth quarter turn, thereby causing the contact arms 18and 19 of contact 17 to move from contacts 71 to contacts 70. llVhenthis occurs, the magnet 48 is cle-energized and the spring Y46 opensthemotor switch 45 and the motor 43 will stop.

The motor 100 will now operate for a brief period sufficiently to bringthe notch 122 of the disc 110 into radial alignment with the camfollower 107 to permit opening of the contacts 102 and 103. Then themotor 100 will stop as the circuit through the motor will be opened. Thecycle of operation of the switches controlled by the motor 100 is nowcompleted and will not be repeated until the operator manually turns thedisc 110 sufliciently to close the contacts 102 and 103 again.

By changing the angular relation of the stationary contact supportingplate 25 relative to the shaft 20, the relation which the valve 30 bearsto its seat 31 when the valve 30 stops rotating may be varied. If thevalve 30, when brought to rest, should not be in proper position withrespect to certain ports (not shown) in valve seat 31, the screws 21 maybe loosened so as to permit turning the housing 23 upon the bearingprovided by the clamping ring 22. By turning the housing 23, the plate25 carrying contacts 70, 71, 70, 71 is turned so as to change theangular distance through which the valve 30 will be turned during thenext operation of the motor 43 before the latter stops.

lVhile the form of embodiment of the present invention as hereindisclosed, constitutes a preferred form, it is to be understood thatother forms might be adopted, all comingI within the scope of the claimswhich follow.

That is claimed is as follows:

1. An electric switch comprising, in combination, a case, a shaftextending into and supported by the case, a movable Contact supported bythe shaft, a plate, relatively stationary contacts insulatinglysupported by the plate and cooperating with the movable contact, a coversupporting the plate, and means attached to the case for supporting thecover in various positions of angular adjustment relative to the axis ofrotation of the rotary contact.

2. An electric switch comprising, in combination, a case, a shaftextending into and supported by the case, a movable Contact supported bythe shaft, relatively stationary contacts within the case cooperatingwith the movable contact, a cover for the case insulating supporting thestationary contacts, and means for securing the cover to the case invarious positions of angular adjustment relative to said shaft.

An electric switch comprising, in combination, a case, a shaft extendinginto and supported by the case, a movable contact having a centralportion and contact arms extending therefrom insulatingly supported bythe shaft, a stationary central contact for engaging the movable contactat the central portion thereof, other relatively stationary vio contactsarranged in a circular row for cooperation with the arms of the movablecontact, a nonconducting plate supporting all of the stationary contactssecured to a movable housing, and means for securing the housing to thecase in various positions of an lar adjustment relative to the axis ofthe shaft.

4. An electric switch comprising in combination, a case, a shaftextending into and supported by the case; a movable contact supported bythe shaft, relatively stationary contacts Within the case cooperatingwith the movable contact, a cover for the case insulatingly supportingthe stationary contacts; and means for securing the cover to the case toadjust infinitely the angular movement of the contacts relative to theaxis of the shaft.

In testimony whereof I hereto aix my signature.

LEO C. SHIPPY.

